RIO DE JANEIRO, Brazil — U.S. anti-narcotics officials warned Monday that the unprecedented discovery of Amazon coca plantations means Brazilian authorities will have to be vigilant against the spread of cocaine production to their country.

The Brazilian army said Sunday it found a laboratory to make cocaine and four coca plantations spread over more than 250 acres of jungle clearings in the Amazon, a vast region long considered unsuitable for the crop.

If cocaine can be made to grow in the sweltering climate, “the Amazon would be a perfect area, with all the brush and uninhabited areas. It almost creates a perfect opportunity,” U.S. Drug Enforcement Administration spokesman Garrison Courtney said.

PrAna has always had it out for plastics. The yoga brand in 2010 began shipping more of its clothes wrapped in paper and string, rather than the customary plastic sleeves. But when Boulder passed its Universal Zero Waste Ordinance, requiring businesses to recycle and compost, employees of the Pearl Street store saw opportunity to do more.